code: def test_df_type_pandas(self):
      actual_output = df_type(self.pd_df)
      expected_output = "pandas"
      self.assertEqual(actual_output, expected_output)
  
file_path: pandas-ai/tests/test_df_info.py
imports: import unittest
  import pandas
  import polars
  from pandasai.helpers.df_info import df_type
label_desc: Use image node_id 2 for calling the TestDfInfo obj's underlying member method code with example usage: obj.test_df_type_pandas() without return types